研究目的
Design a circularly polarized microstrip patch antenna on an ultrathin PET substrate for UHF RFID applications, overcoming the challenges of impedance matching and radiation performance on such thin substrates.
研究成果
The proposed antenna demonstrates excellent circular polarization performance with a wide axial ratio beam width, making it suitable for UHF RFID reader applications. The improved feeding techniques successfully address impedance matching challenges on ultrathin substrates, enabling low-profile designs for portable and access-control uses.
研究不足
The antenna has low efficiency due to the extremely thin substrate, leading to lower peak gain, which may require high-sensitivity receivers or increased transmitted power for RFID applications. The design is specific to UHF band and may not generalize to other frequencies or substrates.
1：Experimental Design and Method Selection:
The antenna design involves a nearly square patch with truncated corners for circular polarization, fed by cascaded microstrip lines including a quarter-wave transformer for impedance matching. Systematic optimization of design parameters is performed using a full-wave EM simulator.
2：Sample Selection and Data Sources:
The antenna is fabricated on a PET substrate with screen-printed silver coating. No specific datasets are mentioned; simulations are based on design parameters.
3：List of Experimental Equipment and Materials:
PET substrate (thickness 125 μm, dielectric constant εr =
4：4, tan δ = 02), silver coating (thickness 25 μm), and simulation software (Ansys Electronics Desktop). Experimental Procedures and Operational Workflow:
Design the antenna geometry, optimize parameters (e.g., ΔL1 and ΔL2 for corner truncations), simulate S11 and axial ratio characteristics, and analyze radiation patterns.
5：Data Analysis Methods:
Use the EM simulator to characterize impedance bandwidth, axial ratio bandwidth, and radiation patterns; parameters are optimized for performance.
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